Condensation Control & Part F Ventilation
Condensation is the most common moisture issue in modern homes. This guide breaks down Part F ventilation expectations and practical steps to keep humidity in check.
Why condensation happens
Condensation forms when moist air meets a cooler surface. Without consistent ventilation and heating, moisture accumulates and encourages mould growth, particularly in bathrooms, kitchens and bedrooms.
What Part F requires
Part F outlines airflow targets for extract fans and background ventilation. It is especially relevant for retrofits and extensions where airtightness improves but ventilation is not upgraded.
Building a ventilation strategy
- Confirm extractor fans meet required airflow and are used consistently.
- Ensure background ventilation is available through trickle vents or passive inlets.
- Balance heating, drying routines and moisture-producing activities.
If you are unsure whether your ventilation setup is sufficient, our Damp & Mould Surveys and Independent Damp Survey services include airflow testing and humidity assessment.
Common mistakes to avoid
Relying solely on dehumidifiers, switching off fans, or sealing vents can trap moisture inside. Focus on a balanced, whole-house approach instead.
FAQs
What is Part F ventilation?
Part F is the UK building regulation guidance for ventilation, covering airflow rates, extract requirements and background ventilation.
Do extractor fans alone stop condensation?
Fans help, but condensation control also needs steady background airflow, balanced heating and moisture management.
Should I run a dehumidifier instead?
Dehumidifiers can reduce symptoms, but they do not replace proper ventilation or resolve moisture sources.
Can an independent survey check ventilation performance?
Yes. We test airflow, humidity patterns and extractor performance to see if the current system meets practical needs.
Next steps
Get a clear ventilation and condensation action plan before committing to upgrades.